1286414 - AC_CHECK_FUNCs in our configure script will always fail on Windows

Status: NEW

(Firefox Build System :: General, defect)

Description

[Chris Manchester (limited bugmail, email directly)]

I noticed that libffi's build system thinks we have alloca available for a windows build, but a similar check in our (old-)configure script things we do not.

We're setting /TC in CFLAGS, which means cl interprets every input file as a C source, and we're adding several .lib files to LIBS, which appears to be used when autoconf expects to link something as part of a test, so these checks fail on Windows with a string of errors like:

conftest.c

kernel32.lib

c1: fatal error C1083: Cannot open source file: 'kernel32.lib': No such file or directory

user32.lib

c1: fatal error C1083: Cannot open source file: 'user32.lib': No such file or directory

gdi32.lib

c1: fatal error C1083: Cannot open source file: 'gdi32.lib': No such file or directory

winmm.lib

c1: fatal error C1083: Cannot open source file: 'winmm.lib': No such file or directory

wsock32.lib

c1: fatal error C1083: Cannot open source file: 'wsock32.lib': No such file or directory

advapi32.lib

c1: fatal error C1083: Cannot open source file: 'advapi32.lib': No such file or directory

secur32.lib

c1: fatal error C1083: Cannot open source file: 'secur32.lib': No such file or directory


At least in the case of libffi, HAVE_ALLOCA does not appear to be checked meaningfully when building on Windows. But we should either fix these checks or skip them entirely on Windows if they aren't relevant.