URL:
<https://savannah.gnu.org/support/?110271>
Summary: libSDL2 fails with autoconf 2.70
Project: Autoconf
Submitted by: rossburton
Submitted on: Thu 16 Jul 2020 03:28:14 PM UTC
Category: None
Priority: 5 - Normal
Severity: 3 - Normal
Status: None
Privacy: Public
Assigned to: None
Originator Email:
Open/Closed: Open
Discussion Lock: Any
Operating System: None
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Details:
First, apologies if we've already discussed this but I cant find the
discussion.
libSDL2 fails to configure with autoconf 2.70 but works with 2.69:
| checking for size_t... yes
| checking for M_PI in math.h... ../SDL2-2.0.12/configure: line 13202: CPP:
command not found
| checking how to run the C preprocessor... gcc -E
| ../SDL2-2.0.12/configure: line 13328: ac_fn_c_try_cpp: command not found
| ../SDL2-2.0.12/configure: line 13328: ac_fn_c_try_cpp: command not found
| configure: error: in
`/home/pokybuild/yocto-worker/qemux86-64/build/build/tmp/work/x86_64-linux/libsdl2-native/2.0.12-r0/build':
| configure: error: C preprocessor "gcc -E" fails sanity check
| See `config.log' for more details
| WARNING: exit code 1 from a shell command.
The configure.ac is just a very badly named macro:
AC_CHECK_DEFINE(M_PI, math.h)
Which is implemented here:
https://github.com/spurious/SDL-mirror/blob/master/acinclude/ac_check_define.m4
This uses AC_EGREP_CPP but it doesn't appear to explicitly look for a cpp. My
workaround is to explicltly call AC_PROG_CPP earlier: should AC_EGREP_CPP be
doing this, or should this requirement be documented?
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