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* fix global visibility (vis.h) support for out-of-tree buildsRich Felker2016-01-201-1/+1
| | | | | | commit 2f853dd6b9a95d5b13ee8f9df762125e0588df5d failed to change the test for -include vis.h support to use $srcdir, so vis.h was always disabled by configure for out-of-tree builds.
* support out-of-tree buildPetr Hosek2016-01-171-5/+25
| | | | | | | | | | | | this change adds support for building musl outside of the source tree. the implementation is similar to autotools where running configure in a different directory creates config.mak in the current working directory and symlinks the makefile, which contains the logic for creating all necessary directories and resolving paths relative to the source directory. to support both in-tree and out-of-tree builds with implicit make rules, all object files are now placed into a separate directory.
* work around toolchains with broken visibility in libgcc/libpccRich Felker2015-11-071-0/+5
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* have configure check/add --gc-sections linker optionRich Felker2015-11-041-0/+4
| | | | | | | | this allowing the linker to drop certain weak definitions that are only used as dummies for static linking. they could be eliminated for shared library builds using the preprocessor instead, but we are trying to transition to using the same object files for shared and static libc, so a link-time solution is preferable.
* have configure check/add linker options to reduce size lost to paddingRich Felker2015-11-041-0/+6
| | | | | | based on patch by Denys Vlasenko. sorting sections and common data symbols by alignment acts as an approximation for optimal packing, which the linker does not actually support.
* have configure check/add -ffunction-sections and -fdata-sectionsRich Felker2015-11-041-0/+11
| | | | | | | | | | | | | | | | | | based on patch by Denys Vlasenko. the original intent for using these options was to enable linking optimizations. these are immediately available for static linking applications to libc.a, and will also be used for linking libc.so in a subsequent commit. in addition to the original motives, this change works around a whole class of toolchain bugs where the compiler generates relative address expressions using a weak symbol and the assembler "optimizes out" the relocation which should result by using the weak definition. (see gas pr 18561 and gcc pr 66609, 68178, etc. for examples.) by having different functions and data objects in their own sections, all relative address expressions are cross-section and thus cannot be resolved to constants until link time. this allows us to retain support for affected compiler/assembler versions without invasive and fragile source-level workarounds.
* keep user-provided CFLAGS/LDFLAGS separate from those added by configureRich Felker2015-11-021-2/+4
| | | | | | this way, overriding these variables on the make command line (or just re-passing the originally-passed values when invoking make) won't suppress use of the flags added by configure.
* prevent user CFLAGS overrides from exposing executable stackRich Felker2015-10-231-7/+7
| | | | | | | | | | | the option to suppress executable stack tagging was placed in CFLAGS, which is treated as optional and overridable by the build system. if a user replaces CFLAGS after configure has run, it could get lost, resulting in a libc.so that's flagged as needing executable stack, which would cause the kernel to map the initial stack as executable. move -Wa,--noexecstack to CFLAGS_C99FSE, the make variable used for mandatory compiler options.
* suppress sh assembler rejection of instructions based on isa levelRich Felker2015-10-151-0/+1
| | | | | | we need access to all instructions in order for runtime selection of atomic model to work correctly. without this patch, some versions of gcc instruct gas to reject instructions outside the target isa level.
* eliminate protected-visibility data in libc.so with vis.h preincludeRich Felker2015-09-291-3/+11
| | | | | | | | | | | | | | | some newer binutils versions print scary warnings about protected data because most gcc versions fail to produce the right address references/relocations for such data that might be subject to copy relocations. originally vis.h explicitly assigned default visibility to all public data symbols to avoid this issue, but commit b8dda24fe1caa901a99580f7a52defb95aedb67c removed this treatment for stdin/out/err to work around a gcc 3.x bug, and since they don't actually need it (because taking their addresses is not valid C). instead, a check for the gcc 3.x bug is added to the configure check for vis.h preinclude support; this feature will simply be disabled when using a buggy version of gcc.
* try to suppress linking libc.so if there are undefined symbolsRich Felker2015-09-221-0/+6
| | | | | | | | | | this is always an error and usually results from failure to find/link the compiler runtime library, but it could also result from implementation errors in libc, using functions that don't (yet) exist. either way the resulting libc.so will crash mysteriously at runtime. the crash happens too early to produce a meaningful error, so these crashes are very confusing to users and waste a lot of debugging time. this commit should ensure that they do not happen.
* remove configure's suppression of enable sh/fdpic shared library buildRich Felker2015-09-221-1/+0
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* add sh fdpic subarch variantsRich Felker2015-09-121-0/+4
| | | | | | | | | with this commit it should be possible to produce a working static-linked fdpic libc and application binaries for sh. the changes in reloc.h are largely unused at this point since dynamic linking is not supported, but the CRTJMP macro is used one place outside of dynamic linking, in __unmapself.
* Build process uses script to add CFI directives to x86 asmAlex Dowad2015-08-261-0/+17
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Some functions implemented in asm need to use EBP for purposes other than acting as a frame pointer. (Notably, it is used for the 6th argument to syscalls with 6 arguments.) Without frame pointers, GDB can only show backtraces if it gets CFI information from a .debug_frame or .eh_frame ELF section. Rather than littering our asm with ugly .cfi directives, use an awk script to insert them in the right places during the build process, so GDB can keep track of where the current stack frame is relative to the stack pointer. This means GDB can produce beautiful stack traces at any given point when single-stepping through asm functions. Additionally, when registers are saved on the stack and later overwritten, emit ..cfi directives so GDB will know where they were saved relative to the stack pointer. This way, when you look back up the stack from within an asm function, you can still reliably print the values of local variables in the caller. If this awk script were to understand every possible wild and crazy contortion that an asm programmer can do with the stack and registers, and always emit the exact ..cfi directives needed for GDB to know what the register values were in the preceding stack frame, it would necessarily be as complex as a full x86 emulator. That way lies madness. Hence, we assume that the stack pointer will _only_ ever be adjusted using push/pop or else add/sub with a constant. We do not attempt to detect every possible way that a register value could be saved for later use, just the simple and common ways. Thanks to Szabolcs Nagy for suggesting numerous improvements to this code.
* add musl-clang, a wrapper for system clang installsShiz2015-07-061-1/+12
| | | | | | | | | | | | | | musl-clang allows the user to compile musl-powered programs using their already existent clang install, without the need of a special cross compiler. it achieves this by wrapping around both the system clang install and the linker and passing them special flags to re-target musl at runtime. it does only affect invocations done through the special musl-clang wrapper script, so that the user setup remains fully intact otherwise. the clang wrapper consists of the compiler frontend wrapper script, musl-clang, and the linker wrapper script, ld.musl-clang. musl-clang makes sure clang invokes ld.musl-clang to link objects; neither script needs to be in PATH for the wrapper to work.
* build: fix musl-targeting toolchain testShiz2015-07-061-9/+8
| | | | | | | | | | | | | | | the old test was broken in that it would never fail on a toolchains built without dynamic linking support, leading to the wrapper script possibly being installed on compilers that do not support it. in addition, the new test is portable across compilers: the old test only worked on GCC. the new test works by testing whether the toolchain libc defines __GLIBC__: most non-musl Linux libc's do define this for compatibility even when they are not glibc, so this is a safe bet to check for musl. in addition, the compiler runtime would need to have a somewhat glibc-compatible ABI in the first place, so any non-glibc compatible libc's compiler runtime might not work. it is safer to disable these cases by default and have the user enable the wrappers manually there using --enable-wrapper if they certain it works.
* build: overhaul wrapper script system for multiple wrapper supportShiz2015-07-061-20/+36
| | | | | | | | | | | | | | | this overhauls part of the build system in order to support multiple toolchain wrapper scripts, as opposed to solely the musl-gcc wrapper as before. it thereby replaces --enable-gcc-wrapper with --enable-wrapper=..., which has the options 'auto' (the default, detect whether to use wrappers), 'all' (build and install all wrappers), 'no' (don't build any) and finally the options named after the individual compiler scripts (currently only 'gcc' is available) to build and install only that wrapper. the old --enable-gcc-wrapper is removed from --help, but still available. it also modifies the wrappers to use the C compiler specified to the build system as 'inner' compiler, when applicable. as wrapper detection works by probing this compiler, it may not work with any other.
* configure: work around compilers that merely warn for unknown optionsShiz2015-05-281-2/+12
| | | | | | | | | | | some compilers (such as clang) accept unknown options without error, but then print warnings on each invocation, cluttering the build output and burying meaningful warnings. this patch makes configure's tryflag and tryldflag functions use additional options to turn the unknown-option warnings into errors, if available, but only at check time. these options are not output in config.mak to avoid the risk of spurious build breakage; if they work, they will have already done their job at configure time.
* fix syntax errors in configure scriptRich Felker2015-04-221-2/+2
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* make configure check for visibility preinclude compatible with pccRich Felker2015-04-221-3/+3
| | | | | | | | | | | | | pcc does not search for -include relative to the working directory unless -I. is used. rather than adding -I., which could be problematic if there's extra junk in the top-level directory, switch back to the old method (reverting commit 60ed988fd6c67b489d7cc186ecaa9db4e5c25b8c) of using -include vis.h and relying on -I./src/internal being present on the command line (which the Makefile guarantees). to fix the breakage that was present in trycppif checks with the old method, $CFLAGS_AUTO is removed from the command line passed to trycppif; this is valid since $CFLAGS_AUTO should not contain options that alter compiler semantics or ABI, only optimizations, warnings, etc.
* configure: check for -march and -mtune passed via CCAndre McCurdy2015-04-211-2/+4
| | | | | | | | Some build environments pass -march and -mtune as part of CC, therefore update configure to check both CC and CFLAGS before making the decision to fall back to generic -march and -mtune options for x86. Signed-off-by: Andre McCurdy <armccurdy@gmail.com>
* fix regression in configure script with new visibility optionRich Felker2015-04-201-3/+3
| | | | | | | | | commit de2b67f8d41e08caa56bf6540277f6561edb647f introduced a regression by adding a -include option to CFLAGS_AUTO which did not work without additional -I options. this broke subsequent trycppif tests and caused x86_64 to be misdetected as x32, among other issues. simply using the full relative pathname to vis.h rather than -I is the cleanest way to fix the problem.
* add optional global visibility overrideRich Felker2015-04-191-1/+30
| | | | | | | | | | | | this is implemented via the build system and does not affect source files. the idea is to use protected or hidden visibility to prevent the compiler from pessimizing function calls within a shared (or position-independent static) libc in the form of overhead setting up for a call through the PLT. the ld-time symbol binding via the -Bsymbolic-functions option already optimized out the PLT itself, but not the code in the caller needed to support a call through the PLT. on some archs this overhead can be substantial; on others it's trivial.
* allow libc itself to be built with stack protector enabledRich Felker2015-04-131-1/+9
| | | | | | | | | | | | | | | | | | | | this was already essentially possible as a result of the previous commits changing the dynamic linker/thread pointer bootstrap process. this commit mainly adds build system infrastructure: configure no longer attempts to disable stack protector. instead it simply determines how so the makefile can disable stack protector for a few translation units used during early startup. stack protector is also disabled for memcpy and memset since compilers (incorrectly) generate calls to them on some archs to implement struct initialization and assignment, and such calls may creep into early initialization. no explicit attempt to enable stack protector is made by configure at this time; any stack protector option supported by the compiler can be passed to configure in CFLAGS, and if the compiler uses stack protector by default, this default is respected.
* add aarch64 portSzabolcs Nagy2015-03-111-0/+5
| | | | | | | | | | This adds complete aarch64 target support including bigendian subarch. Some of the long double math functions are known to be broken otherwise interfaces should be fully functional, but at this point consider this port experimental. Initial work on this port was done by Sireesh Tripurari and Kevin Bortis.
* fix failure of configure to detect gcc due to message translationsRich Felker2015-01-301-1/+1
| | | | | | | based on patch by Vadim Ushakov. in general overriding LC_ALL rather than specific categories (here, LC_MESSAGES) is undesirable, but LC_ALL is easier and in this case there is nothing else that depends on the locale in this invocation of the compiler.
* add or1k (OpenRISC 1000) architecture portStefan Kristiansson2014-07-181-0/+1
| | | | | | | | | | | | | | | With the exception of a fenv implementation, the port is fully featured. The port has been tested in or1ksim, the golden reference functional simulator for OpenRISC 1000. It passes all libc-test tests (except the math tests that requires a fenv implementation). The port assumes an or1k implementation that has support for atomic instructions (l.lwa/l.swa). Although it passes all the libc-test tests, the port is still in an experimental state, and has yet experienced very little 'real-world' use.
* work around constant folding bug 61144 in gcc 4.9.0 and 4.9.1Rich Felker2014-07-161-21/+0
| | | | | | | | | | | | | | | | | | | | | | | | previously we detected this bug in configure and issued advice for a workaround, but this turned out not to work. since then gcc 4.9.0 has appeared in several distributions, and now 4.9.1 has been released without a fix despite this being a wrong code generation bug which is supposed to be a release-blocker, per gcc policy. since the scope of the bug seems to affect only data objects (rather than functions) whose definitions are overridable, and there are only a very small number of these in musl, I am just changing them from const to volatile for the time being. simply removing the const would be sufficient to make gcc 4.9.1 work (the non-const case was inadvertently fixed as part of another change in gcc), and this would also be sufficient with 4.9.0 if we forced -O0 on the affected files or on the whole build. however it's cleaner to just remove all the broken compiler detection and use volatile, which will ensure that they are never constant-folded. the quality of a non-broken compiler's output should not be affected except for the fact that these objects are no longer const and thus possibly add a few bytes to data/bss. this change can be reconsidered and possibly reverted at some point in the future when the broken gcc versions are no longer relevant.
* remove optimization-inhibiting behavior from configure's --enable-debugRich Felker2014-06-201-5/+2
| | | | | | | this behavior turned out to be counter-intuitive to users and in any case it's unnecessary. optimization can be disabled explicitly using the --disable-optimize option, or both can be achieved without any enable/disable options by passing CFLAGS="-O0 -g".
* fail configure on --enable-shared if -Bsymbolic-functions doesn't workRich Felker2014-06-101-1/+4
| | | | | | | | previously, a warning was issued in this case no matter what, even if --disable-shared was used. now, the default for --enable-shared is changed from "yes" to "auto", and the warning is issued by default, but becomes an error if --enable-shared is used, and the test is suppressed completely if --disable-shared is used.
* trivial formatting fix for the config.mak generated by configureRich Felker2014-05-201-1/+1
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* add configure check for broken gcc 4.9.0 and possibly other versionsRich Felker2014-05-191-5/+37
| | | | | | | | | | | this is gcc bug #61144. the broken compiler is detected, but the user must manually work around it. this is partly to avoid complex logic for adding workaround CFLAGS and attempting to recheck with them, and partly for the sake of letting the user know the compiler is broken (since the workaround will result in less-efficient code production). some refactoring was also needed to move the check for gcc outside of the check for whether to build the compiler wrapper.
* add configure check for working compilerRich Felker2014-05-121-0/+9
| | | | | | without this, broken choices of CC/CPPFLAGS/CFLAGS don't show up until late in the configure process where they are confusingly reported as a different failure such as incorrect long double type.
* fix superh nofpu check on old gcc versionsBobby Bingham2014-04-271-1/+1
| | | | | | | | | | | | | As far as gcc3 knows, sh4 is the only processor version that can have an FPU, so it indicates the FPU's presence by defining __SH4__. This is not defined if there is no FPU, even if the processor really is an SH4. Starting with gcc4, there is support for the sh2a processor, which has an FPU but is not an SH4. gcc4 therefore additionally defines __SH_FPU_ANY__ when there is an FPU, but still doesn't define __SH4__ for an FPU-less sh4. Therefore, to support all gcc versions, we must look at both preprocessor symbols.
* configure: check for __ILP32__ if arch is x86_64rofl0r2014-03-191-0/+4
| | | | | otherwise a multilib compiler used with -mx32 will not be detected properly.
* make configure accept alternate gcc tuples for x32Rich Felker2014-03-171-1/+1
| | | | | | | | the previous pattern required "x32" to be used as the second field of the gcc tuple, which is usually reserved for vendor use and not appropriate as an ABI specifier. with this change, putting "x32" at the end of the tuple, the way ABI specifiers are normally done, is also permitted.
* improve configure's target arch matchingRich Felker2014-02-281-4/+6
| | | | | | | | | | | most notably, it was failing to match sh4-*, etc., but in general the explicit matching of hyphens for some archs was problematic because it failed to accept simply the musl-style arch name (without a gcc-style tuple) as an input. the original motivation of matching hyphens was to prevent incorrectly identifying a 64-bit arch as the corresponding 32-bit arch (e.g. mips* matching mips64) but this is easily fixed by simply checking (and for now, rejecting as unsupported) the relevant 64-bit archs.
* fix missing CFLAGS in configure test for float on shRich Felker2014-02-281-1/+1
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* fix copy-and-paste error in configure's IEEE double check for shRich Felker2014-02-271-1/+1
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* add nofpu subarchs to the sh arch, and properly detect compiler's fpu configRich Felker2014-02-271-2/+18
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* fix endian subarchs for sh archRich Felker2014-02-271-2/+2
| | | | | default endianness for sh on linux is little, and while conventions vary, "eb" seems to be the most widely used suffix for big endian.
* rename superh port to "sh" for consistencyRich Felker2014-02-271-2/+2
| | | | | | | | | linux, gcc, etc. all use "sh" as the name for the superh arch. there was already some inconsistency internally in musl: the dynamic linker was searching for "ld-musl-sh.path" as its path file despite its own name being "ld-musl-superh.so.1". there was some sentiment in both directions as to how to resolve the inconsistency, but overall "sh" was favored.
* mips: add mips-sf subarch support (soft-float)Szabolcs Nagy2014-02-241-2/+4
| | | | | | | | | Userspace emulated floating-point (gcc -msoft-float) is not compatible with the default mips abi (assumes an FPU or in kernel emulation of it). Soft vs hard float abi should not be mixed, __mips_soft_float is checked in musl's configure script and there is no runtime check. The -sf subarch does not save/restore floating-point registers in setjmp/longjmp and only provides dummy fenv implementation.
* superh portBobby Bingham2014-02-231-0/+4
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* configure: suppress bogus pointer-int cast warningsrofl0r2014-02-231-0/+1
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* configure: recognize x86_64-x32 and x32rofl0r2014-02-231-0/+1
| | | | | | | | | | | x32 is the internal arch name, but glibc uses x86_64-x32. there doesn't exist a specific triple for x32 in gcc and binutils. you're supposed to build your compiler for x86_64 and configure it with multilib support for "mx32". however it turns out that using a triple of x86_64-x32 makes gcc and binutils pick up the right arch (they detect it as x86_64) and allows us to have a unique triple for cross-compiler toolchains.
* remove -Wcast-align from --enable-warningsRich Felker2013-08-281-1/+0
| | | | | | | | | | | I originally added this warning option based on a misunderstanding of how it works. it does not warn whenever the destination of the cast has stricter alignment; it only warns in cases where misaligned dereference could lead to a fault. thus, it's essentially a no-op for i386, which had me wrongly believing the code was clean for this warning level. on other archs, numerous diagnostic messages are produced, and all of them are false-positives, so it's better just not to use it.
* add attribute((may_alias)) checking in configureRich Felker2013-08-271-0/+21
| | | | | | this will be needed for upcoming commits to the string/mem functions to correct their unannounced use of aliasing violations for word-at-a-time search, fill, and copy operations.
* fix two bugs in sed code configure uses to save command lineRich Felker2013-08-201-1/+1
| | | | | | | one place where semicolon (non-portable) was still used in place of separate -e options (copied over from an old version of this code), and use of a literal slash in the bracket expression for the final command, despite slash being used as the delimiter for the s command.
* make configure store its command line in config.mak for easy re-runRich Felker2013-08-161-1/+11
| | | | | proper shell quoting and pretty-printing (avoiding ugly gratuitous quoting and bad quoting style) is included.