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* 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.
* fix detection of arm hardfloatRich Felker2013-08-161-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | it turns out that __SOFTFP__ does not indicate the ABI in use but rather that fpu instructions are not to be used at all. this is specified in ARM's documentation so I'm unclear on how I previously got the wrong idea. unfortunately, this resulted in the 0.9.12 release producing a dynamic linker with the wrong name. fortunately, there do not yet seem to be any public toolchain builds using the wrong name. the __ARM_PCS_VFP macro does not seem to be official from ARM, and in fact it was missing from the very earliest gcc versions (around 4.5.x) that added -mfloat-abi=hard. it would be possible on such versions to perform some ugly linker-based tests instead in hopes that the linker will reject ABI-mismatching object files, if there is demand for supporting such versions. I would probably prefer to document which versions are broken and warn users to manually add -D__ARM_PCS_VFP if using such a version. there's definitely an argument to be made that the fenv macros should be exposed even in -mfloat-abi=softfp mode. for now, I have chosen not to expose them in this case, since the math library will not necessarily have the capability to raise exceptions (it depends on the CFLAGS used to compile it), and since exceptions are officially excluded from the ARM EABI, which the plain "arm" arch aims to follow.
* allow subarch-specific asm, including asm specific to the defaultRich Felker2013-08-111-0/+6
| | | | | | | | | | | | | the default subarch is the one whose full name is just the base arch name, with no suffixes. normally, either the asm in the default subarch is suitable for all subarch variants, or separate asm is mandatory for each variant. however, in the case of asm which is purely for optimization purposes, it's possible to have asm that only works (or only performs well) on the default subarch, and not any othe the other variants. thus, I have added a mechanism to give a name to the default variant, for example "armel" for the default, little-endian arm. further such default-subarch names can be added in the future as needed.
* protect against long double type mismatches (mainly powerpc for now)Rich Felker2013-08-021-0/+21
| | | | | | check in configure to be polite (failing early if we're going to fail) and in vfprintf.c since that is the point at which a mismatching type would be extremely dangerous.
* work around gcc 4.8's generation of self-referential mem* functions at -O3Rich Felker2013-08-011-0/+10
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* do not include math modules in the default -O3 optimization setRich Felker2013-07-241-1/+1
| | | | | | it's not clear that -O3 helps them, and gcc seems to have floating point optimization bugs that introduce additional failures when -O3 is used on some of these files.
* enhance build process to allow selective -O3 optimizationRich Felker2013-07-221-12/+54
| | | | | | | | | | | | | | | | | the motivation for this patch is that the vast majority of libc is code that does not benefit at all from optimizations, but that certain components like string/memory operations can be major performance bottlenecks. at the same time, the old -falign-*=1 options are removed, since they were only beneficial for avoiding bloat when global -O3 was used, and in that case, they may have prevented some of the performance gains. to be the most useful, this patch will need further tuning. in particular, research is needed to determine which components should be built with -O3 by default, and it may be desirable to remove the hard-coded -O3 and instead allow more customization of the optimization level used for selected modules.
* fix invalid C in new trycppif tests in configure scriptRich Felker2013-07-181-1/+2
| | | | | an empty program is not valid and would be reasonable grounds for the compiler to give an error, which would break these tests.
* add build system support for arch endian & float abi variantsRich Felker2013-07-181-0/+32
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* treat invalid C as an error even if warnings aren't enabled.Rich Felker2012-12-111-1/+11
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* fix error in configure script using >/dev/null in noclobber modeRich Felker2012-11-181-1/+1
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* Merge remote-tracking branch 'ppc-port/ppc-squashed'Rich Felker2012-11-141-0/+1
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| * PPC port cleaned up, static linking works well now.rofl0r2012-11-131-0/+1
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* | fix "configure --prefix=" and improve path/arg handling in configureRich Felker2012-11-081-16/+12
|/ | | | | | | previously, empty string was treated as "use default". this is apparently not compatible with standard configure semantics where an empty prefix puts everything under /. the new logic should be a lot cleaner and not suffer from such issues.
* further pcc fixes in configureRich Felker2012-10-261-3/+4
| | | | | | | | -lpcc only works if -nostdlib is not passed, so it's useless. instead, use -print-file-name to look up the full pathname for libpcc.a, and check whether that succeeds before trying to link with the result. also, silence pcc's junk printed on stdout during tests.
* add support for detecting pcc's compiler runtimeRich Felker2012-10-261-0/+1
| | | | | | | | | | in old versions of pcc, the directory containing libpcc.a was not in the library path, and other options like -print-file-name may have been needed to locate it. however, -print-file-name itself seems to have been added around the same time that the directory was added to the search path, and moreover, I see no evidence that older versions of pcc are capable of building a working musl shared library. thus, it seems reasonable to just test whether -lpcc is accepted.
* configure: test not just compiling but linking with -march/-mtuneRich Felker2012-10-251-2/+2
| | | | | | pcc wrongly passes any option beginning with -m to the linker, and will break at link time if these options were added to CFLAGS. testing linking lets us catch this at configure time and skip them.
* use $CC rather than "$CC" in configure scriptRich Felker2012-10-181-4/+4
| | | | this is necessary to allow $CC with arguments in it
* tell the assembler to mark all files as not requiring executable stackRich Felker2012-10-031-0/+7
| | | | | | | | | | | for some reason this option is undocumented. not sure when it was added, so I'm using a configure test. gcc was already setting the mark correctly for C files, but assembler source files would need ugly .note boilerplate in every single file to achieve this without the option to the assembler. blame whoever thought it would be a good idea to make the stack executable by default rather than doing it the other way around...
* microblaze portRich Felker2012-09-291-0/+1
| | | | | | based on initial work by rdp, with heavy modifications. some features including threads are untested because qemu app-level emulation seems to be broken and I do not have a proper system image for testing.
* add LIBCC (compiler runtime) logic and override to configureRich Felker2012-09-101-0/+7
| | | | | | | | | this should both fix the issue with ARM needing -lgcc_eh (although that's really a bug in the libgcc build process that's causing considerable bloat, which should be fixed) and make it easier to build musl using clang/llvm in place of gcc. unfortunately I don't know a good way to detect and support pcc's -lpcc since it's not in pcc's default library search path...
* get rid of eh_frame bloatRich Felker2012-08-291-3/+12
| | | | | | if needed for debugging, it will be output in the .debug_frame section instead, where it is not part of the loaded program and where the strip command is free to strip it.
* add gnu hash support in the dynamic linkerRich Felker2012-08-251-1/+1
| | | | based on the patches contributed by boris brezillon.
* support configuring cross compiling with CROSS_COMPILE prefix variableRich Felker2012-08-141-3/+6
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* make configure accept mipselRich Felker2012-08-051-1/+1
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* remove configure check disabling shared libraries on mipsRich Felker2012-08-051-4/+0
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* disable dynamic linking on mips for now (broken)Rich Felker2012-07-121-0/+5
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* initial version of mips (o32) port, based on work by Richard Pennington (rdp)Rich Felker2012-07-111-0/+1
| | | | | | | | | | | | | basically, this version of the code was obtained by starting with rdp's work from his ellcc source tree, adapting it to musl's build system and coding style, auditing the bits headers for discrepencies with kernel definitions or glibc/LSB ABI or large file issues, fixing up incompatibility with the old binutils from aboriginal linux, and adding some new special cases to deal with the oddities of sigaction and pipe syscall interfaces on mips. at present, minimal test programs work, but some interfaces are broken or missing. threaded programs probably will not link.
* configure: only use -ffloat-store on i386Rich Felker2012-07-031-1/+1
| | | | | | | | | this option is expensive and only used on old gcc's that lack -fexcess-precision=standed, but it's not needed on non-i386 archs where floating point does not have excess precision anyway. if musl ever supports m68k, i think it will need to be special-cased too. i'm not aware of any other archs with excess precision.
* check for ld support of -Bsymbolic-functions; disable shared if not availRich Felker2012-06-071-0/+7
| | | | | | | | | this issue affects the last gpl2 version of binutils, which some people are still using out of aversion to gpl3. musl requires -Bsymbolic-functions because it's the only way to make a libc.so that's able to operate prior to dynamic linking but that still behaves correctly with respect to global vars that may be moved to the main program via copy relocations.
* use -nostdlib in linker tests to avoid possible missing crt/lib issuesRich Felker2012-06-071-1/+1
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* avoid linking main program in linker testsRich Felker2012-06-071-2/+2
| | | | | | it's possible that the user has provided a compiler that does not have any libc to link to, so linking a main program is a bad idea. instead, generate an empty shared library with no dependencies.
* make configure try to disable stack protectorRich Felker2012-06-061-0/+2
| | | | | | | | in theory we could support stack protector in the libc itself, and users wanting to experiment with such usage could add -fstack-protector to CFLAGS intentionally. but to avoid breakage in the default case, override broken distro-patched gcc that forces stack protector on.