[patch #8505] ac_cv_header_lua_h always set to yes

[anonymous]

Follow-up Comment #1, patch #8505 (project autoconf-archive):

Sorry for the late reply, I had to remember the syntax of autoconf first.

As I understand, AX_LUA_HEADERS() will search for lua.h in /usr/include
because of the <> brackets.
If lua{,lib,xlib}.h are found in /usr/include (default) AC_CHECK_HEADERS will
return yes. If by any chance the version is not what we expect, the function
will fail without going through the directory list.
I changed the script to make it work in my environment at least and it needs
probably some improvements.

For the test,
/usr/include contains lua{,lib,xlib}.h version 5.1
/usr/include/lua5.1 contains lua{,lib,xlib}.h version 5.1
/usr/include/lua5.2 contains lua{,lib,xlib}.h version 5.2
I'm looking for version 5.2
./configure returns,

checking if LUA_VERSION is defined... yes
checking for library containing exp... -lm
checking for library containing dlopen... -ldl
checking for library containing lua_load... -llua5.2
checking whether sys/types.h defines makedev... yes
checking whether to enable assertions... yes
checking if LUA_VERSION is defined... yes
checking lua.h usability... yes
checking lua.h presence... yes
checking for lua.h... yes
checking lualib.h usability... yes
checking lualib.h presence... yes
checking for lualib.h... yes
checking lauxlib.h usability... yes
checking lauxlib.h presence... yes
checking for lauxlib.h... yes
checking luaconf.h usability... yes
checking luaconf.h presence... yes
checking for luaconf.h... yes
checking if Lua header version 5.1 matches 5.2... no
checking for lua.h... (cached) yes
checking for lualib.h... (cached) yes
checking for lauxlib.h... (cached) yes
checking for luaconf.h... (cached) yes
checking if Lua header version 5.2 matches 5.2... yes
[...]
           prefix:            /usr
           exec prefix:       ${prefix}

           localstatedir:     ${prefix}/var
           pkgconfigdir:      ${libdir}/pkgconfig
           rundir:            ${localstatedir}/run
           bindir:            ${exec_prefix}/bin
           sbindir:           ${exec_prefix}/sbin
           libdir:            ${exec_prefix}/lib
           includedir:        ${prefix}/include
           luaincludedir:     /usr/include/lua5.2
           luadir:            ${prefix}/share/lua/5.2
           luaexecdir:        ${exec_prefix}/lib/lua/5.2
           pkgluadir:         ${luadir}/mytest
           pkgluaexecdir:     ${luaexecdir}/mytest


Also the '(cached)' comment of configure still puzzles me.
Does it really read the right directory ?
Anyway CPPFLAGS has the right pathname for lua.h in confdefs.h.

What I can say, autoconf is not easy to debug ;)

Regards


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