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[libpng17] Allow unversioned links created on install to be disabled in

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configure.  In configure builds 'make install' changes/adds links like png.h
and libpng.a to point to the newly installed, versioned, files (e.g.
libpng17/png.h and libpng17.a). Three new configure options and some
rearrangement of Makefile.am allow creation of these links to be disabled.
This commit is contained in:
John Bowler
2013-12-29 19:40:13 -06:00
committed by Glenn Randers-Pehrson
parent 206d1eed42
commit 4413d5dcd2
4 changed files with 130 additions and 42 deletions
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59
configure.ac
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@@ -137,12 +137,20 @@ AC_CHECK_FUNCS([memset memcpy strncpy],,
# floor and ceil are required for FLOATING_POINT, but they can be turned off on
# the configure command line (and they are independent.) Default is to 'on'
AC_ARG_ENABLE([floating-point],[Enable floating point APIs],,
[enable_floating_point=yes])
AC_ARG_ENABLE([fixed-point],[Enable fixed point APIs],,
[enable_fixed_point=yes])
AC_ARG_ENABLE([floating-arithmetic],[Use floating point arithmetic internally],,
[enable_floating_arithmetic=yes])
AC_ARG_ENABLE([floating-point],
AS_HELP_STRING([[[--enabled-floating-point]]],
[Enable floating point APIs (default: yes)]),,
[enable_floating_point=yes])
AC_ARG_ENABLE([fixed-point],
AS_HELP_STRING([[[--enable-fixed-point]]],
[Enable fixed point APIs (default: yes)]),,
[enable_fixed_point=yes])
AC_ARG_ENABLE([floating-arithmetic],
AS_HELP_STRING([[[--enable-floating-arithmetic]]],
[Use floating point arithmetic internally (default: yes)]),,
[enable_floating_arithmetic=yes])
# Check for a requirement for math library support
if test "$enable_floating_arithmetic" = yes
@@ -334,6 +342,45 @@ AC_ARG_WITH(libpng-prefix,
fi])
AM_CONDITIONAL([DO_PNG_PREFIX], [test "${with_libpng_prefix:-no}" != "no"])
# Control over what links are made for installed files. Versioned files are
# always installed, when the following options are turned on corresponding
# unversioned links are also created (normally as symbolic links):
AC_ARG_ENABLE([unversioned-links],
AS_HELP_STRING([[[--enable-unversioned-links]]],
[Installed libpng header files are placed in a versioned subdirectory]
[and installed libpng library (including DLL) files are versioned.]
[If this option is enabled unversioned links will be created pointing to]
[the corresponding installed files. If you use libpng.pc or]
[libpng-config for all builds you do not need these links, but if you]
[compile programs directly they will typically #include <png.h> and]
[link with -lpng; in that case you need the links.]
[The links can be installed manually using 'make install-header-links']
[and 'make install-library-links' and can be removed using the]
[corresponding uninstall- targets. If you do enable this option every]
[libpng 'make install' will recreate the links to point to the just]
[installed version of libpng. The default is to create the links;]
[use --disable-unversioned-links to change this]))
# The AM_CONDITIONAL test is written so that the default is enabled;
# --disable-unversioned-links must be given to turn the option off.
AM_CONDITIONAL([DO_INSTALL_LINKS],[test "$enable_unversioned_links" != "no"])
AC_ARG_ENABLE([unversioned-libpng-pc],
AS_HELP_STRING([[[--enable-unversioned-libpng-pc]]],
[Install the configuration file 'libpng.pc' as a link to the versioned]
[version. This is done by default - use --disable-unversioned-libpng-pc]
[to change this.]))
AM_CONDITIONAL([DO_INSTALL_LIBPNG_PC],
[test "$enable_unversioned_libpng_pc" != "no"])
AC_ARG_ENABLE([unversioned-libpng-config],
AS_HELP_STRING([[[--enable-unversioned-libpng-config]]],
[Install the configuration file 'libpng-config' as a link to the]
[versioned version. This is done by default - use]
[--disable-unversioned-libpng-config to change this.]))
AM_CONDITIONAL([DO_INSTALL_LIBPNG_CONFIG],
[test "$enable_unversioned_libpng_config" != "no"])
# HOST SPECIFIC OPTIONS
# =====================
#