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meson: Add support for detecting gss without pkg-config

This is required as MIT Kerberos does provide neither pkg-config nor cmakedependency information on windows.Reported-by: Dave Page <dpage@pgadmin.org>Reviewed-by: Tristan Partin <tristan@partin.io>Discussion:https://postgr.es/m/20240709065101.xhc74r3mdg2lmn4w@awork3.anarazel.deBackpatch: 16-, where meson support was added

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`‎meson.build`

Lines changed: 44 additions & 6 deletions

Original file line number	Diff line number	Diff line change
`@@ -620,33 +620,66 @@ gssapiopt = get_option('gssapi')`
`620`	`620`	`krb_srvtab=''`
`621`	`621`	`have_gssapi=false`
`622`	`622`	`ifnot gssapiopt.disabled()`
`623`		`- gssapi=dependency('krb5-gssapi',required:gssapiopt)`
	`623`	`+ gssapi=dependency('krb5-gssapi',required:false)`
`624`	`624`	`have_gssapi= gssapi.found()`
`625`	`625`
	`626`	`+if have_gssapi`
	`627`	`+ gssapi_deps= [gssapi]`
	`628`	`+elifnot have_gssapi`
	`629`	`+# Hardcoded lookup for gssapi. This is necessary as gssapi on windows does`
	`630`	`+# not install neither pkg-config nor cmake dependency information.`
	`631`	`+if host_system=='windows'`
	`632`	`+ is_64= cc.sizeof('void *',args: test_c_args)==8`
	`633`	`+if is_64`
	`634`	`+ gssapi_search_libs= ['gssapi64','krb5_64','comerr64']`
	`635`	`+else`
	`636`	`+ gssapi_search_libs= ['gssapi32','krb5_32','comerr32']`
	`637`	`+endif`
	`638`	`+else`
	`639`	`+ gssapi_search_libs= ['gssapi_krb5']`
	`640`	`+endif`
	`641`	`+`
	`642`	`+ gssapi_deps= []`
	`643`	`+foreachlibname: gssapi_search_libs`
	`644`	`+ lib= cc.find_library(libname,dirs: test_lib_d,required:false)`
	`645`	`+if lib.found()`
	`646`	`+ have_gssapi=true`
	`647`	`+ gssapi_deps+= lib`
	`648`	`+endif`
	`649`	`+endforeach`
	`650`	`+`
	`651`	`+if have_gssapi`
	`652`	`+# Meson before 0.57.0 did not support using check_header() etc with`
	`653`	`+# declare_dependency(). Thus the tests below use the library looked up`
	`654`	`+# above. Once we require a newer meson version, we can simplify.`
	`655`	`+ gssapi=declare_dependency(dependencies: gssapi_deps)`
	`656`	`+endif`
	`657`	`+endif`
	`658`	`+`
`626`	`659`	`ifnot have_gssapi`
`627`		`-elif cc.check_header('gssapi/gssapi.h',dependencies:gssapi,required:false,`
	`660`	`+elif cc.check_header('gssapi/gssapi.h',dependencies:gssapi_deps,required:false,`
`628`	`661`	`args: test_c_args,include_directories: postgres_inc)`
`629`	`662`	`cdata.set('HAVE_GSSAPI_GSSAPI_H',1)`
`630`		`-elif cc.check_header('gssapi.h',dependencies:gssapi,required: gssapiopt,`
	`663`	`+elif cc.check_header('gssapi.h',dependencies:gssapi_deps,required: gssapiopt,`
`631`	`664`	`args: test_c_args,include_directories: postgres_inc)`
`632`	`665`	`cdata.set('HAVE_GSSAPI_H',1)`
`633`	`666`	`else`
`634`	`667`	`have_gssapi=false`
`635`	`668`	`endif`
`636`	`669`
`637`	`670`	`ifnot have_gssapi`
`638`		`-elif cc.check_header('gssapi/gssapi_ext.h',dependencies:gssapi,required:false,`
	`671`	`+elif cc.check_header('gssapi/gssapi_ext.h',dependencies:gssapi_deps,required:false,`
`639`	`672`	`args: test_c_args,include_directories: postgres_inc)`
`640`	`673`	`cdata.set('HAVE_GSSAPI_GSSAPI_EXT_H',1)`
`641`		`-elif cc.check_header('gssapi_ext.h',dependencies:gssapi,required: gssapiopt,`
	`674`	`+elif cc.check_header('gssapi_ext.h',dependencies:gssapi_deps,required: gssapiopt,`
`642`	`675`	`args: test_c_args,include_directories: postgres_inc)`
`643`	`676`	`cdata.set('HAVE_GSSAPI_EXT_H',1)`
`644`	`677`	`else`
`645`	`678`	`have_gssapi=false`
`646`	`679`	`endif`
`647`	`680`
`648`	`681`	`ifnot have_gssapi`
`649`		`-elif cc.has_function('gss_store_cred_into',dependencies:gssapi,`
	`682`	`+elif cc.has_function('gss_store_cred_into',dependencies:gssapi_deps,`
`650`	`683`	`args: test_c_args,include_directories: postgres_inc)`
`651`	`684`	`cdata.set('ENABLE_GSS',1)`
`652`	`685`
`@@ -657,6 +690,11 @@ if not gssapiopt.disabled()`
`657`	`690`	`else`
`658`	`691`	`have_gssapi=false`
`659`	`692`	`endif`
	`693`	`+`
	`694`	`+ifnot have_gssapiand gssapiopt.enabled()`
	`695`	`+error('dependency lookup for gssapi failed')`
	`696`	`+endif`
	`697`	`+`
`660`	`698`	`endif`
`661`	`699`	`ifnot have_gssapi`
`662`	`700`	`gssapi= not_found_dep`

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